/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.channel.socket;

import io.netty.buffer.ByteBufAllocator;
import io.netty.channel.ChannelException;
import io.netty.channel.ChannelOption;
import io.netty.channel.DefaultChannelConfig;
import io.netty.channel.MessageSizeEstimator;
import io.netty.channel.RecvByteBufAllocator;
import io.netty.channel.WriteBufferWaterMark;
import io.netty.util.internal.PlatformDependent;

import java.net.Socket;
import java.net.SocketException;
import java.util.Map;

import static io.netty.channel.ChannelOption.*;

/**
 * The default {@link SocketChannelConfig} implementation.
 */
public class DefaultSocketChannelConfig extends DefaultChannelConfig
        implements SocketChannelConfig
{

    protected final Socket javaSocket;

    private volatile boolean allowHalfClosure;

    /**
     * Creates a new instance.
     */
    public DefaultSocketChannelConfig(SocketChannel channel, Socket javaSocket)
    {
        super(channel);
        if (javaSocket == null)
        {
            throw new NullPointerException("javaSocket");
        }
        this.javaSocket = javaSocket;

        // Enable TCP_NODELAY by default if possible.
        if (PlatformDependent.canEnableTcpNoDelayByDefault())
        {
            try
            {
                setTcpNoDelay(true);
            }
            catch (Exception e)
            {
                // Ignore.
            }
        }
    }

    @Override
    public Map<ChannelOption<?>, Object> getOptions()
    {
        return getOptions(super.getOptions(), SO_RCVBUF, SO_SNDBUF, TCP_NODELAY,
                SO_KEEPALIVE, SO_REUSEADDR, SO_LINGER, IP_TOS,
                ALLOW_HALF_CLOSURE);
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T> T getOption(ChannelOption<T> option)
    {
        if (option == SO_RCVBUF)
        {
            return (T) Integer.valueOf(getReceiveBufferSize());
        }
        if (option == SO_SNDBUF)
        {
            return (T) Integer.valueOf(getSendBufferSize());
        }
        if (option == TCP_NODELAY)
        {
            return (T) Boolean.valueOf(isTcpNoDelay());
        }
        if (option == SO_KEEPALIVE)
        {
            return (T) Boolean.valueOf(isKeepAlive());
        }
        if (option == SO_REUSEADDR)
        {
            return (T) Boolean.valueOf(isReuseAddress());
        }
        if (option == SO_LINGER)
        {
            return (T) Integer.valueOf(getSoLinger());
        }
        if (option == IP_TOS)
        {
            return (T) Integer.valueOf(getTrafficClass());
        }
        if (option == ALLOW_HALF_CLOSURE)
        {
            return (T) Boolean.valueOf(isAllowHalfClosure());
        }

        return super.getOption(option);
    }

    @Override
    public <T> boolean setOption(ChannelOption<T> option, T value)
    {
        validate(option, value);

        if (option == SO_RCVBUF)
        {
            setReceiveBufferSize((Integer) value);
        }
        else if (option == SO_SNDBUF)
        {
            setSendBufferSize((Integer) value);
        }
        else if (option == TCP_NODELAY)
        {
            setTcpNoDelay((Boolean) value);
        }
        else if (option == SO_KEEPALIVE)
        {
            setKeepAlive((Boolean) value);
        }
        else if (option == SO_REUSEADDR)
        {
            setReuseAddress((Boolean) value);
        }
        else if (option == SO_LINGER)
        {
            setSoLinger((Integer) value);
        }
        else if (option == IP_TOS)
        {
            setTrafficClass((Integer) value);
        }
        else if (option == ALLOW_HALF_CLOSURE)
        {
            setAllowHalfClosure((Boolean) value);
        }
        else
        {
            return super.setOption(option, value);
        }

        return true;
    }

    @Override
    public int getReceiveBufferSize()
    {
        try
        {
            return javaSocket.getReceiveBufferSize();
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public int getSendBufferSize()
    {
        try
        {
            return javaSocket.getSendBufferSize();
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public int getSoLinger()
    {
        try
        {
            return javaSocket.getSoLinger();
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public int getTrafficClass()
    {
        try
        {
            return javaSocket.getTrafficClass();
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isKeepAlive()
    {
        try
        {
            return javaSocket.getKeepAlive();
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isReuseAddress()
    {
        try
        {
            return javaSocket.getReuseAddress();
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public boolean isTcpNoDelay()
    {
        try
        {
            return javaSocket.getTcpNoDelay();
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
    }

    @Override
    public SocketChannelConfig setKeepAlive(boolean keepAlive)
    {
        try
        {
            javaSocket.setKeepAlive(keepAlive);
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setPerformancePreferences(int connectionTime,
            int latency, int bandwidth)
    {
        javaSocket.setPerformancePreferences(connectionTime, latency,
                bandwidth);
        return this;
    }

    @Override
    public SocketChannelConfig setReceiveBufferSize(int receiveBufferSize)
    {
        try
        {
            javaSocket.setReceiveBufferSize(receiveBufferSize);
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setReuseAddress(boolean reuseAddress)
    {
        try
        {
            javaSocket.setReuseAddress(reuseAddress);
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setSendBufferSize(int sendBufferSize)
    {
        try
        {
            javaSocket.setSendBufferSize(sendBufferSize);
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setSoLinger(int soLinger)
    {
        try
        {
            if (soLinger < 0)
            {
                javaSocket.setSoLinger(false, 0);
            }
            else
            {
                javaSocket.setSoLinger(true, soLinger);
            }
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setTcpNoDelay(boolean tcpNoDelay)
    {
        try
        {
            javaSocket.setTcpNoDelay(tcpNoDelay);
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public SocketChannelConfig setTrafficClass(int trafficClass)
    {
        try
        {
            javaSocket.setTrafficClass(trafficClass);
        }
        catch (SocketException e)
        {
            throw new ChannelException(e);
        }
        return this;
    }

    @Override
    public boolean isAllowHalfClosure()
    {
        return allowHalfClosure;
    }

    @Override
    public SocketChannelConfig setAllowHalfClosure(boolean allowHalfClosure)
    {
        this.allowHalfClosure = allowHalfClosure;
        return this;
    }

    @Override
    public SocketChannelConfig setConnectTimeoutMillis(int connectTimeoutMillis)
    {
        super.setConnectTimeoutMillis(connectTimeoutMillis);
        return this;
    }

    @Override
    @Deprecated
    public SocketChannelConfig setMaxMessagesPerRead(int maxMessagesPerRead)
    {
        super.setMaxMessagesPerRead(maxMessagesPerRead);
        return this;
    }

    @Override
    public SocketChannelConfig setWriteSpinCount(int writeSpinCount)
    {
        super.setWriteSpinCount(writeSpinCount);
        return this;
    }

    @Override
    public SocketChannelConfig setAllocator(ByteBufAllocator allocator)
    {
        super.setAllocator(allocator);
        return this;
    }

    @Override
    public SocketChannelConfig setRecvByteBufAllocator(
            RecvByteBufAllocator allocator)
    {
        super.setRecvByteBufAllocator(allocator);
        return this;
    }

    @Override
    public SocketChannelConfig setAutoRead(boolean autoRead)
    {
        super.setAutoRead(autoRead);
        return this;
    }

    @Override
    public SocketChannelConfig setAutoClose(boolean autoClose)
    {
        super.setAutoClose(autoClose);
        return this;
    }

    @Override
    public SocketChannelConfig setWriteBufferHighWaterMark(
            int writeBufferHighWaterMark)
    {
        super.setWriteBufferHighWaterMark(writeBufferHighWaterMark);
        return this;
    }

    @Override
    public SocketChannelConfig setWriteBufferLowWaterMark(
            int writeBufferLowWaterMark)
    {
        super.setWriteBufferLowWaterMark(writeBufferLowWaterMark);
        return this;
    }

    @Override
    public SocketChannelConfig setWriteBufferWaterMark(
            WriteBufferWaterMark writeBufferWaterMark)
    {
        super.setWriteBufferWaterMark(writeBufferWaterMark);
        return this;
    }

    @Override
    public SocketChannelConfig setMessageSizeEstimator(
            MessageSizeEstimator estimator)
    {
        super.setMessageSizeEstimator(estimator);
        return this;
    }
}
